Tacho reading double

[Cront]

Hi guys,

I recently got a ZXR 400 H model and I've been having a lot of fun. My problem is the tacho is reading double. Now I know this has come up before and the answer is probably the battery but I don't have any trouble starting the bike at all so I find it a little weird. I originally thought it was a loose ground but that didn't seem to fix it. Could it be anything else?

Cheers,

Cront

[RedexRobB]

Well thats what the others had as far as i know, the bike was starting and running fine just the tacho was messing about. Changed the battery and all was hunky dory.

[Cront]

So...changed the battery and same problem. What would be the next thing to check?

[zxr_oli]

Maybe it is just reading in KM?

[Cront]

I'm in Australia so yes my SPEEDO is reading in KM but the issue here is actually with my tacho reading double

[RedexRobB]

Maybe it is just reading in KM?

its the rev counter not the speedo

Have you checked the wiring? Theres a black wire that goes from the tacho to one of the coils and also to the ECU. Check the contact blocks make sure theres no corrsion.

Feel i must apologise because you may have bought that battery for nothing, sorry.

[zxr_oli]

Ahh, now i feel like an idiot..........

[masterofinsanity]

Feel i must apologise because you may have bought that battery for nothing, sorry.

how can you buy something for nothing? if you buy something you have to pay a price, if its nothing then its free so you can't buy it.

[RedexRobB]

sarcy bugger

[Cront]

Yeah I'm going to check all the wiring again, could it perhaps be the coil? I have to admit I've got nfi when it comes to motorcycle mechanics so bear with me here. The first point of contact after the battery is the starter motor right? There seems to be a bit or corrosion on the wires that contact there. Also sometimes, although not very often, it sorts itself out and starts reading true which was what made me think there was a loose ground wire going to the tacho. Could this be caused by anything else?

PS don't worry about the battery it was the only way to rule it out.

[Cront]

I've also spoken to a shop around here and their first suggestion was just to stick another tacho on, unfortunately they didn't have one and it seems a bit strange to me if it is a busted tacho that it would read true every now and then.

[Cront]

Can anyone tell me where all the wires coming from the tacho go? Is it one or 2 to one of the coils? And is that all? This tacho is doing my head in.

[Northern ANdy]

brown is a 12v feed, fused and switched

black / yellow is earth

black does the actual sensing of the rpm, and meets up with the coil wire and fuel pump relay

[Cront]

If anyone is interest I ended up fixing this by cleaning up the contacts in the plug from the tacho to the loom

[MillaMeter]

I had the same problem here viewtopic.php?f=7&t=5540

Turns out that hitting the toad out of the counter actually works! lol